SE0101652L - Process of drying a web-shaped material - Google Patents

Process of drying a web-shaped material

Info

Publication number
SE0101652L
SE0101652L SE0101652A SE0101652A SE0101652L SE 0101652 L SE0101652 L SE 0101652L SE 0101652 A SE0101652 A SE 0101652A SE 0101652 A SE0101652 A SE 0101652A SE 0101652 L SE0101652 L SE 0101652L
Authority
SE
Sweden
Prior art keywords
flow
air
process air
drying
web
Prior art date
Application number
SE0101652A
Other languages
Swedish (sv)
Other versions
SE0101652D0 (en
SE519090C2 (en
Inventor
Evert Nilsson
Krister Sandblad
Original Assignee
Flaekt Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Flaekt Ab filed Critical Flaekt Ab
Priority to SE0101652A priority Critical patent/SE519090C2/en
Publication of SE0101652D0 publication Critical patent/SE0101652D0/en
Publication of SE0101652L publication Critical patent/SE0101652L/en
Publication of SE519090C2 publication Critical patent/SE519090C2/en

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/18—Drying webs by hot air
    • D21F5/185—Supporting webs in hot air dryers
    • D21F5/187—Supporting webs in hot air dryers by air jets
    • D21F5/188—Blowing devices

Landscapes

  • Drying Of Solid Materials (AREA)
  • Paper (AREA)

Abstract

The flow of air being removed from the dryer section, the flow of process air and the supply of heat to the process air are all controlled so that two of these parameters remain constant whilst the other is varied, in order to alter drying performance. A method for drying a web (1), preferably a paper web, comprises passing the web through a dryer section (20) containing several levels of blowboxes (12, 13), so that the web is supported by a cushion of hot process air on the top side of the lower blowboxes (12), in order to carry out contact-free drying. Steam generated by the water expelled from the web is mixed with and carried away by the process air, at least some of which is recirculated. The non-recirculated air is replaced with a corresponding amount of air having a low moisture content. The flow of non-recirculated air being removed, the flow of the process air and the supply of heat to the process air are all controlled during drying. Under a first condition when there is only a need for low performance drying, the flow of non-recirculated air being removed and the flow of process air are kept essentially constant, whilst the supply of heat to the process air is varied in order to alter drying performance. Under a second condition when there is only a need for medium to high performance drying, the flow of process air and the supply of heat to the process air are kept essentially constant, whilst the flow of non-recirculated air being removed is varied. Under a third condition when there is a need for high performance drying, the flow of non-recirculated air being removed and the supply of heat to the process air are kept essentially constant, whilst the flow of process air is varied.
SE0101652A 2001-05-11 2001-05-11 Contact free drying of e.g. paper, comprises keeping constant two parameters and altering one parameter chosen from removed air flow, process air flow and heat supply SE519090C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SE0101652A SE519090C2 (en) 2001-05-11 2001-05-11 Contact free drying of e.g. paper, comprises keeping constant two parameters and altering one parameter chosen from removed air flow, process air flow and heat supply

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE0101652A SE519090C2 (en) 2001-05-11 2001-05-11 Contact free drying of e.g. paper, comprises keeping constant two parameters and altering one parameter chosen from removed air flow, process air flow and heat supply

Publications (3)

Publication Number Publication Date
SE0101652D0 SE0101652D0 (en) 2001-05-11
SE0101652L true SE0101652L (en) 2002-11-12
SE519090C2 SE519090C2 (en) 2003-01-07

Family

ID=20284062

Family Applications (1)

Application Number Title Priority Date Filing Date
SE0101652A SE519090C2 (en) 2001-05-11 2001-05-11 Contact free drying of e.g. paper, comprises keeping constant two parameters and altering one parameter chosen from removed air flow, process air flow and heat supply

Country Status (1)

Country Link
SE (1) SE519090C2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109990593A (en) * 2019-04-02 2019-07-09 卢俊超 A kind of method that paper is dry

Also Published As

Publication number Publication date
SE0101652D0 (en) 2001-05-11
SE519090C2 (en) 2003-01-07

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Legal Events

Date Code Title Description
NUG Patent has lapsed